CN1049783C - A communications system and method therefor - Google Patents
A communications system and method therefor Download PDFInfo
- Publication number
- CN1049783C CN1049783C CN93114720A CN93114720A CN1049783C CN 1049783 C CN1049783 C CN 1049783C CN 93114720 A CN93114720 A CN 93114720A CN 93114720 A CN93114720 A CN 93114720A CN 1049783 C CN1049783 C CN 1049783C
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- Prior art keywords
- signal
- frequency
- channel
- base station
- mobile communications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
- H04W68/04—User notification, e.g. alerting and paging, for incoming communication, change of service or the like multi-step notification using statistical or historical mobility data
Abstract
A wide-area two-way communications system provides two-way communication between a plurality of mobile communications devices, responsive to a first plurality of frequency channels and configured to transmit on a second plurality of frequency channels, distributed throughout a plurality of coverage areas, each administered by a base station that only transmits signals, to said plurality of mobile communications devices, on a single frequency channel of said first plurality of frequency channels and that is receptive to transmissions on said second plurality of frequency channels. The method comprises the steps of transmitting a first signal from more than one base station, receiving the first signal at a scanning mobile communications device and establishing a two-way communication by using a first frequency channel.
Description
Relate generally to of the present invention is two-way radio communications system on a large scale, and is applied to have the two-way radio communications system of scan channel and locking means particularly.
At present, be provided for two kinds of diverse ways, for example SABER being arranged aspect the intercommunication system on a large scale of ambulatory transceiver device
Portable radio, for single stationary transceivers, this scope can't effectively cover (trade mark that SABER is Motorola Inc.) too greatly at first, with broadcasting or accurate synchro system, promptly from some remote transceivers come at same wireless frequency f
1The broadcasting of same signal, this system often is used to issue the signal broadcasting of ambulatory transceiver device.Mobile transceiver second frequency f
2Send signal to remote transceiver.Remote transceiver is received frequency f
2On mobile transmission, handle by a central controller then, with the received signal that offers the best.More specifically, processing utilizes a receiver selective system to carry out, thereby the signal that all remote transceivers are received compares mutually, and therefrom selects the highest signal of quality.The advantage of simulcasting system is effectively to utilize single wireless frequency to (promptly comprising frequency f
1And f
2Channel), and system operation is simple.But unfortunately, provide cost stable and the accurately sound signal of phasing very high to remote transceiver.More specifically, the line of fall requirement that is used for the interconnection remote transceiver is carried out large-scale standard and is regulated the sound signal that accurate phasing just is provided.In addition, even best simulcasting system also has overlapping area, the sound signal of ambulatory transceiver device reception is of low quality there.
Another method that adopts is one scan and locking means, and in order to the signal of broadcasting from some transceivers, each transceiver all is in a remote zone and is operated in different transmission frequency.The receiver of ambulatory transceiver device scans all broadcasting frequencys in its existing zone and is locked on the signal of any acceptable signal strength signal intensity.With the same with situation about broadcasting, no matter how the position always sends a frequency mobile transceiver, and with a central controller usually broadcasting similar mode selective reception device to same, the best signal of being received with the transceiver of selecting in remote zone.Scanning and locking means be better than with the broadcasting method part, and being to scan and lock provides shirtsleeve operation, higher audio quality and lower engineering cost.In addition, scanning and locking means provide movably path for the conversion to the digital coding communication system.Unfortunately, scanning also has some limitations with locking.At first, it is lower to scan and be locked in the wireless channel utilization efficient, promptly scans and lock the more a plurality of frequencies of requirement.In addition, mobile transceiver must be equipped with several scanning circuits at least, preferably scanning circuit and selection circuit.In addition, long-range (base station) transceiver sends in variable frequency, and mobile transceiver transmits with a common frequency of determining, this requirement has produced planning problem, namely as a rule must be with the frequency at regular interval to coming allocated channel.More particularly, entering first scanning and the mobile transceiver of ' locked ' zone from second scanning and ' locked ' zone, can't work in the first area, is different because frequency is matched.Another intrinsic problem of scanning and locking is that the sweep time of mobile transceiver in some cases can be quite lasting.Be generally 0.5 to 2 second sweep time.Yet, when normal speech speed is about 3 speech of per second, the major part of this calling that can account for sweep time.Current, reduce the impact of scanning with the restriction scan period, this scan period is the several times from signal complete obiteration a period of time of remote transceiver that receive.
As seen, need a kind of two-way radio communications system on a large scale, it can avoid the inherent shortcoming of present two-way radio communications system on a large scale.More specifically, need more effectively to utilize wireless frequency spectrum and can adopt the right scanning system of standard frequency.In addition, wish to have the two-way radio communications system on a large scale without propagation delay, this delay results from scanning process and causes the periodic loss of the ambulatory transceiver device signal reception of communication system.
The present invention solves some problem at least of above-mentioned prior art.According to the present invention, a kind of How It Works of intercommunication system on a large scale is provided, this communication system provides the two-way communication between a plurality of mobile communications devices, first group of channel of this communication response and being arranged on second group of channel transmits, these channel distribution are at a plurality of areas of coverage, each district is by a BTS management, and signal is only transmitted to described a plurality of mobile communications devices on the channel in described first group of channel in this base station, and receives transmission on described second group of channel.This method may further comprise the steps: send first signal from more than one base station; A scanning mobile communications device in described a plurality of mobile communications devices receives described first signal, and sets up two-way communication by one first channel that utilizes this single channel and second group of channel between a certain base station and described scanning mobile communications device.Between the single channel and first channel definite frequency interval is arranged.
In a most preferred embodiment, before the step that transmits one first signal, carry out step earlier at second group of channel of each base station scans, on second channel of second class frequency, transmit a secondary signal of coming the self-scanning mobile communications device; And receive steps such as this secondary signal in the base station.In addition, the transmission of first signal continues for some time.In addition, before setting up the step of two-way communication, the scanning mobile device is determined the quality of the described first signal that receives, thereby makes the step of setting up two-way communication between scanning mobile communications device and certain base station through quality.In intercommunication system on a large scale of the present invention, the base station of adjacent coverage area sends simultaneously with different channels, and determined frequency interval is that the bifrequency of standard is right.
In another aspect of this invention, provide a kind of mobile communications device of intercommunication system on a large scale that is used for.This mobile communications device comprises: a radio scanner is used for receiving selectively the signal of first frequency; A transmitter is used for sending selectively the signal of second frequency; Checkout gear is used to detect the frequency of received signal; And a transmitter channel choice device, be used to select can select to send the frequency of signal, to have preset frequency frequency at interval right so that the detection frequency of the frequency of selecting to send signal and received signal forms.This mobile communications device also comprises selecting arrangement, is used for differentiating the quality that receives signal and selecting a quality to satisfy the reception signal of demand on signal quality.
Below in conjunction with accompanying drawing, one embodiment of the present of invention are described.
Fig. 1 show ground prior art scanning and lock intercommunication system on a large scale.
Fig. 2 has shown the most preferred embodiment according to intercommunication system on a large scale of the present invention.
Fig. 3 has shown the central controller of the intercommunication system on a large scale of Fig. 2.
Fig. 4 has shown the base station of the intercommunication system on a large scale of Fig. 2.
Fig. 5 has shown the ambulatory transceiver device of the intercommunication system on a large scale of Fig. 2.
According to most preferred embodiment of the present invention, a kind of enhancing scanning and locking means (Scanand Lock Plus) provide the additional scanning that is undertaken by base station receiver.This additional scanning makes the T of standard
x-R
xFrequency has kept the operation of full automatic system simultaneously to being kept.
Referring to Fig. 1, wherein shown scanning and the locking communication system 10 of a prior art.Communication system 10 comprises some area of coverage 12-14 that overlapping area 15 is arranged.Fixed base stations 17-19 is in the center of each area of coverage.Each base station 17-19 comprises that a transceiver is used for sending signal and received signal from above-mentioned mobile unit to the mobile unit 21-23 of communication system 10.In addition, base station 17-19 is respectively with frequency T
xB
1, T
xB
2And T
xB
3Send.Base station 17-19 is connected to central controller 25, and the latter is responsible for the control to communication system 10.Base station 17-19 normally realizes by wire link to the connection of central controller 25.Each mobile unit 21-23 includes with frequency T
xM
1Send and with frequency R
xB
1, R
xB
2And R
xB
3The transceiver that receives, the transmitted frequency of corresponding base station is respectively T
xB
1, T
xB
2And T
xB
3The receive frequency R of each base station 17-19
xM
1Corresponding to the transmission frequency T that sends from each mobile unit 21-23
xM
1Therefore, communication system 10 is just like a single-channel architecture on a large scale.
When mobile unit 21-23 sent a calling, (it can comprise the SPECTRATAC that motorola inc makes to central controller 25
The reception selected cell) the transmission sound signal of selecting the base station to receive with optimum receiving signal intensity.(SPECTRATAC is the trade mark of motorola inc) replys for detecting, and mobile unit 21-23 scans all base station transmitted frequency T
xB
1, T
XB
2And T
xB
3And be locked on the first frequency that satisfies the prearranged signals level (scanning and locking) or be locked on the frequency with optimum signal level (scanning, select and locking).During calling out, behind the blackout that discharges talk button (PTT) or receive, mobile unit 21-23 still busy channel namely at specific receive frequency R
xB
1, R
xB
2, R
xB
3One predetermined time of upper maintenance, about 3 seconds usually.This retention time guarantee to converse unlikely be scanned interrupt.
Fig. 2 has shown a most preferred embodiment of intercommunication system on a large scale.Communication system 30 comprises some area of coverage 32-34 that overlay region 35 is arranged.Fixed base stations 37-39 is positioned at the center of each area of coverage 32-34, and this regional wireless coverage is provided.Base station 37-39 respectively comprises transceiver 40-42, is used for to the mobile unit 43-45 of communication system 30 transmission signal and from its received signal.In addition, base station 37-39 is respectively with frequency T
xB
1, T
xB
2And T
xB
3Send.Base station 37-39 links to each other with central controller 46, and the latter manages the control of communication system 30.Central controller has a console, and this console makes the operating personnel of central controller 46 can receive and check the information (signal) that is transmitted by base station 37-39 and imports the information (signal) toward base station 37-39 to be passed.Base station 37-39 is connected with central controller 46, generally realizes through wired or wireless link 50-52.Mobile unit 43-45 comprises transceiver 47-49, and each transceiver is with frequency T
xM
1, T
xM
2And T
xM
3Send signal and with frequency R
xB
1, R
xB
2And R
xB
3Reception is to respond respectively base station transmission frequency T
xB
1, T
xB
2And T
xB
3Mobile unit can be at the area of coverage free-roaming of base station 37-39 service.The receive frequency of each base station 37-39 is R
xM
1, R
xM
2And R
xM
3, corresponding to the transmitted frequency T of each mobile unit 43-45 emission
xB
1, T
xB
2And T
xB
3
Fig. 3 has shown the most preferred embodiment of central controller 46.Central controller 46 comprises receiving lines interface 58, and the latter is used to receive the audio frequency that transmits through wire link 50-52 from base station 37-39 (or other) signal.The receiving lines interface also comprises for the mixting circuit of the reception signal of selecting first water or selects circuit, as those skilled in the art should understand.It will also be appreciated that 71 selection to received signal, can whether satisfy predetermined quality based on received signal at receiving lines interface 58 places, or based on received signal intensity.In addition, receiving lines interface 58 detects the existence that receives signal 71.Thereby receiving lines interface 58 has two signal outputs: the reception output signal 60 that sends the operator through console to; And when demonstration detects the special switch signal of received signal.Central controller 46 also comprises transmitting line interface 55, and the latter makes the operator link to each other with base station 37-39 through console.The communication of the signal 57 that 55 controls of transmitting line interface transmit from console to mobile unit.More specifically, transmitting line interface 55 adds that at signal to be sent coding sends instruction 56, and it indicates base station broadcast signal to be sent when being received by base station 37-39 and decoding.This occurs in console and receives through central controller 46 and send instruction 56 o'clock, or when receiving lines interface 58 detects received signal, in both cases, keeps time-delay 62 to last till that all coding sends instruction period.
Fig. 4 has shown the most preferred embodiment of base station 37-39.Each base station 37-39 all is arranged to way traffic, and promptly they send simultaneously and receive.Each base station 37-39 includes the transmitter 100 that links to each other with antenna 105 and the transceiver 41 of receiver 102.Transceiver 41 sends the also signal of receiving remote unit 43-45.The coding that key decoder 106 detects from central controller 46 sends instruction, and the transmitter 100 of indication transceiver 41 is broadcasted to remote unit 43-45.As discussed above, the different transmission frequency T among each area of coverage 32-34 of 100 usefulness of transmitter
xB
1-T
xB
3In a single dedicated frequency send.
Each base station 37-39 also comprises channel control logic 108, and the latter responds key decoder 106.The logical control logic 108 of this letter links to each other with receiver 102.All frequencies in the receiver 102 scanning communication systems among the 37-39 of base station, the frequency T that is namely sent by mobile unit 43-45
xM
1, T
xM
2And T
xM
3Therefore, can think and comprise a checkout gear that is used to detect the received signal frequency.When receiver 102 when one of this frequency detects the transmission of signal, control logic 108 is forbidden receiver 102 frequency sweep rate T
xM
1, T
xM
2And T
xM
3And be locked on the frequency (or channel) that detects, until the blackout that transmits on it or key decoder 106 have detected the move instruction from central controller 46.For the response move instruction detects, the channel control logic further forces receiver 102 to receive an optimum frequency.In this way, when a calling is carried out, base station 37-39 all a standard frequency to the operation.
Although way traffic is feasible technically, each base station 37-39 is arranged to unidirectional operation usually, and namely sending and receiving can not carry out simultaneously.
Fig. 5 has shown the most preferred embodiment of mobile unit 43-45.Each mobile unit 43-45 comprises having the receiver 122 that links to each other with antenna 125 and the transceiver 47-49 of transmitter 120.Transceiver 47-49 is sent to base station 37-39 to signal and from latter's received signal through antenna 125.Transmitter 120 responses one input signal, this input signal provides through a transducer 128.Receiver 122 provides output signal through for example external loudspeaker 130.Control channel logical one 26 links to each other with receiver 122 with transmitter 120 and control is provided.Instruction (for example being provided by talk button (PTT)) is provided thus be imported into the decision of channel control logic startup transmitter 120.In the situation from the incoming signal of base station 37-39 not, the frequency of all base stations, i.e. T in the receiver 122 continuous sweep communication systems 30
xB
1, T
xB
2And T
xB
3When the signal that detects from the base station, control channel logical one 26 is ended scanning and also is locked on the frequency of incoming signal, until this incoming signal disappears.
Transmitter frequency T with the base station
xB
1, T
xB
2And T
xB
3Difference, the transmitter frequency T of mobile unit 47-49
xM
1, T
xM
2And T
xM
3Can with the receive frequency R of base station
xM
1, R
xM
2And R
xM
3Fixing relation is arranged, such as the duplex frequency of standard pair.After the scan function of mobile unit is ended, promptly when detecting from signal of base station, the transmitter of mobile unit 47-49 will be operated on any transmission frequency with the received signal frequency dependence.When transmitter 120 moves when mobile unit 43-45 scans, mobile unit will send on a damaged channel or last channel in scan abort, and the advanced degree of this channel control logic 126 is relevant.
Strengthen the operation principle of scanning and locking, can send and one call out example by what central controller 46 was replied by mobile unit 43-45 by considering, obtain best explanation.Can be in its arbitrary transmission frequency (to the system T of Fig. 2 during mobile unit 43 beginning
xM
1, T
xM
2And T
xM
3) the upper transmission.These transmit by the transceiver 40-42 of one or more base station 37-39 and receive, and the latter is sent to central controller 46 through wire link, to pass to the operator.Central controller 46 is to pass to the operator.Central controller 46 sends instruction from all base station 37-39 issues one of trend, so that their continuous transmissions.The online time-delay that central controller 46 is introduced has guaranteed that base station 37-39 still continues to transmit several seconds after the incoming call transmission stops.In case mobile unit 43 stops to send, its receiver 122 begins to scan all frequencies and that base station of being locked in subsequently within the scope of being in sends.In the situation of Fig. 2, mobile unit 43 will be locked in the frequency T from base station 37
xB
1On.In another embodiment, when mobile unit 43 sends in the base station of selecting it to lock, adopt the method for selecting.Bi-directional call with operator's (console) can take place in this moment.
As long as base station 37 continues to send and mobile unit 43 is in the scope, all be locked in correct transmitted frequency T from all transmitters of mobile unit 43
xM
1On.If mobile unit 43 moves and disengages with base station 37 subsequently, mobile unit 43 will begin to scan and be locked on the suitable frequency once more, to monitor and to participate in calling, when end of calling, all base stations all stop to transmit and all mobile unit 37-39 begin scanning.It should be understood that the operator and send from the console of central controller 46 in the situation that sends instruction, send instruction and can pass through delayer 56, continue transmission when the response of waiting for from mobile unit 37-39 to guarantee all base stations.Perhaps, communication system can have absent a setting so that all base stations can call out whole the duration send continuously.
One skilled in the art will understand that the required frequency number of restriction one particular coverage area is very important, should also be understood that and adopt the communication system of scan channel to be more vulnerable to interference than single-channel system.Say that statistically if four channels of receiver scanning, then its possibility of being interfered when being fixed on the channel is big four times.Thereby hope prevents from scanning, and interference because of adjacent region produces looks genuine and detect institute and interrupt.Carry out CTCSS (continuous tone coding inhibition system), avoided this problem by a unique coding is provided; This coding identifies the specific transmission of being carried out among the particular transceiver group with infrasonic frequency usually.Only have when mobile transceiver detects a tone signal that is assigned in advance it, mobile transceiver could respond to this transmission.Thereby different districts is with different CTCSS tone/coding protection.In addition, another advantage of CTCSS is a general layout of having improved frequency reuse, and this is necessary in the system with identification channel of adjacent cells.More specifically, if there is not CTCSS, then all interference all must be maintained under the sensitivity of mobile transceiver.To the system of the proportion relevant with CTCSS modulation, if the signal strength signal intensity that receives signal always than interfering signal at least big one for mobile transceiver in the communication system capture than amount the time, just can effectively prevent interference.Therefore, as will be understood, the use of CTCSS concerning available wireless frequency spectrum, has improved the spectrum efficiency of communication system.
As illustrating, aforesaid operations is described the disposal ability that only limits to once have a calling for example.Yet, because base station 37-39 is operated in different transmission frequency T
xB
1, T
xB
2And T
xB
3On, so can operate respectively them.More specifically, a base station 37-39 can be switched out system's (comprising all areas of coverage) and operation on a large scale independently.For example, the operator utilizes the console of central controller 46, and can notify certain base station of all mobile units is that certain area of coverage has been moved out of and operates and be switched to " isolation " purposes on a large scale.For realizing isolation purposes, the receiving lines interface 58 that is positioned at area of coverage central controller, that be used to isolate will be turned off and require to reset the path of the specified channel of being managed by central controller 46.Correspondingly, the transmission from the isolation area of coverage to central controller 46 also is switched to dedicated channel.In addition, if system is furnished with CTCSS on a large scale, the base station of then getting rid of can be switched to different CTCSS codes, thereby restriction is to the access of this base station.Be in the mobile unit of isolating in the area of coverage and can manually select suitable frequency and CTCSS sign indicating number this moment.
Strengthen an expansion of scanning and locking, system with some central controllers is processed by the difference of different base station call out, as long as these different base stations are in outside each other the scope.For realizing this many call treatment, need there be the receiver of certain form to select at central controller, can receive the calling of incoming call to show which concrete base station to the operator.The calling (sending from console) of breathing out will be from all available base station broadcasts.One receiver system of selection then shows has received from which area of coverage and to have replied, thereby makes the operator in case can manually carry out the area of coverage when having set up contact and select.All remaining areas of coverage then can be used for other callings of central controller controls.This function is particularly useful for having the communication system of the big area of coverage.
Can see that so the present invention of the description of design has produced novel advantage, namely one on a large scale two-way radio communications system can be in each area of coverage with standard frequency to carrying out work.
Claims (9)
1. be used to operate the method for intercommunication system on a large scale, this system provides two-way communication between a plurality of mobile communications devices, these mobile communications devices respond first group of channel and are provided on second group of channel and send, these channels distribute on a plurality of areas of coverage, each area of coverage is by a BTS management, this base station only sends signal and receive this transmission on described second group of channel to described a plurality of mobile communications devices on the single channel in described first group of channel, it is characterized in that this method may further comprise the steps:
Before sending first signal, carry out the following step
A) at the described second group of channel of each base station scans;
B) on one second channel of described second class frequency, send secondary signal from the scanning mobile communications device;
C) receive described secondary signal a base station;
D) transmit described first signal from more than one base station;
E) a scanning mobile communications device at described a plurality of mobile communications devices receives described first signal;
F) by utilizing first channel of described single channel and described second group of channel, set up two-way communication between specific base stations and described scanning mobile communications device, wherein said single channel and described first channel have definite frequency interval.
2. according to the method for operation of intercommunication system on a large scale of claim 1, the step that wherein sends first signal is further comprising the steps of:
A) it is sent prolongation a period of time.
3. according to the method for operation of intercommunication system on a large scale of claim 1 or 2, the base station in the wherein adjacent area of coverage sends on different channels.
4. according to the method for operation of intercommunication system on a large scale of claim 1, it is characterized in that before setting up the step of two-way communication, carrying out the following step:
A) in the scanning mobile device, determine described first quality of signals of receiving, thereby make the step of between described scanning mobile communications device and described certain base station, setting up two-way communication be subjected to the quality examination.
5. according to the method for operation of the intercommunication system on a large scale of claim 1, the step that wherein sends first signal from more than one base station is to carry out simultaneously.
6. according to the method for operation of the intercommunication system on a large scale of claim 1, wherein the frequency interval of Que Dinging is that the duplex frequency of standard is right.
7. be used for the mobile communications device of intercommunication system on a large scale, it is characterized in that this device comprises:
A) radio scanner is used for first frequency received signal selectively;
B) transmitter is used for sending signal selectively with a second frequency;
C) checkout gear is used to detect the frequency of received signal;
D) transmitter channel choice device, be used to select the frequency of the signal that sends selectively so that the frequency of selecting the signal that sends is arranged and the detection frequency of received signal to form the frequency with definite frequency interval right.
8. according to the mobile communication system of claim 7, wherein receiver receives a plurality of same signals that the unlike signal quality is arranged with a plurality of frequencies, and this mobile communications device also comprises:
A) choice device, the received signal that is used to distinguish the quality of received signal and selects to satisfy the signal quality examination.
9. according to the mobile communications device of claim 7 or 8, wherein the frequency interval of Que Dinging is that the duplex frequency of a standard is right.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9224935.8 | 1992-11-27 | ||
| GB9224935A GB2273416B (en) | 1992-11-27 | 1992-11-27 | A communications system and method therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1091888A CN1091888A (en) | 1994-09-07 |
| CN1049783C true CN1049783C (en) | 2000-02-23 |
Family
ID=10725811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93114720A Expired - Fee Related CN1049783C (en) | 1992-11-27 | 1993-11-25 | A communications system and method therefor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1049783C (en) |
| GB (1) | GB2273416B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109511147A (en) * | 2019-01-09 | 2019-03-22 | 福建环球通通讯有限公司 | A kind of intercom automatic roaming system and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4750198A (en) * | 1986-12-12 | 1988-06-07 | Astronet Corporation/Plessey U.K. | Cellular radiotelephone system providing diverse separately-accessible groups of channels |
| WO1992006543A1 (en) * | 1990-09-27 | 1992-04-16 | Motorola, Inc. | Communication transfer in a radiotelephone system |
| US5119397A (en) * | 1990-04-26 | 1992-06-02 | Telefonaktiebolaget L M Ericsson | Combined analog and digital cellular telephone system having a secondary set of control channels |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH594324A5 (en) * | 1975-08-27 | 1978-01-13 | Autophon Ag |
-
1992
- 1992-11-27 GB GB9224935A patent/GB2273416B/en not_active Expired - Fee Related
-
1993
- 1993-11-25 CN CN93114720A patent/CN1049783C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4750198A (en) * | 1986-12-12 | 1988-06-07 | Astronet Corporation/Plessey U.K. | Cellular radiotelephone system providing diverse separately-accessible groups of channels |
| US5119397A (en) * | 1990-04-26 | 1992-06-02 | Telefonaktiebolaget L M Ericsson | Combined analog and digital cellular telephone system having a secondary set of control channels |
| WO1992006543A1 (en) * | 1990-09-27 | 1992-04-16 | Motorola, Inc. | Communication transfer in a radiotelephone system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9224935D0 (en) | 1993-01-13 |
| GB2273416A (en) | 1994-06-15 |
| GB2273416B (en) | 1997-03-26 |
| CN1091888A (en) | 1994-09-07 |
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Patentee after: Motorola Limited Patentee before: Motorola Ltd. |
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